package com.webserver.core;

import com.webserver.http.HttpRequest;

import java.io.*;
import java.net.Socket;
import java.util.HashMap;
import java.util.Map;

/**
 * 处理与指定客户端的HTTP交互
 * HTTP交互采取一问一答，因此在这里分为三步完成一次交交互过程：
 * 连接：http://localhost:8088/myweb/index.html
 * 1：解析请求
 * 2：处理请求
 * 3：响应客户端
 */
public class ClientHandler implements Runnable{
    private Socket socket;

    public ClientHandler(Socket socket){
        this.socket=socket; }

    public void run() {
        try {
            //1解析请求
           HttpRequest request=new HttpRequest(socket);
            //2处理请求
            //通过请求对象获取浏览器URL中的抽象路径部分
            /*
                http://localhost:8088/myweb/index.html
                http://localhost:8088/myweb/classTable.html
             */
            String path=request.getUri();
            File file=new File("./webapps"+path);

            //3发送响应
            /*
            发送一个标准的响应，大致如下：
            HTTP/1.1/200 OK(CRLF)
            Content-Type:text/html(CRLF)
            Content-Length:2546((CRLF)(CRLF))
            101110101010101010101....
             */

            OutputStream out=socket.getOutputStream();
            //3.1发送状态行
            String line="Http/1.1 200 OK";
            //UnsupportedEncodingException 原因：字符集名字拼写错误！
            byte[]data=line.getBytes("ISO8859-1");
            out.write(data);
            out.write(13);//written CR
            out.write(10);//written LF


            //3.2:发送响应头
            line = "Content-Type: text/html";
            data = line.getBytes("ISO8859-1");
            out.write(data);
            out.write(13);//written CR
            out.write(10);//written LF

            line = "Content-Length: "+file.length();
            data = line.getBytes("ISO8859-1");
            out.write(data);
            out.write(13);//written CR
            out.write(10);//written LF

            //单独发送CRLF表示响应头发送完毕
            out.write(13);//written CR
            out.write(10);//written LF
            //3.3：发送正文（index页面内容）
            FileInputStream fis=new FileInputStream(file);
            byte[]buf=new byte[1024*8];
            int len;
            while ((len=fis.read(buf))!=-1){
                out.write(buf,0,len);
            }
        }catch (IOException e){
            e.printStackTrace();
        }finally {
            try {
                //交互完毕后与客户端断开链接10000000000000
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }




}
